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\lim_{ x \to \infty }\frac{\sqrt{x+1}+\sqrt{x+2}-\sqrt{4x+12}}{\sqrt{x}+\sqrt{x+2}-\sqrt{4x+12}}
\lim_{ x \to \infty }\frac{\sqrt{x+1}+\sqrt{x+2}-\sqrt{4x+12}}{\sqrt{x}+\sqrt{x+2}-\sqrt{4x+12}}
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